CN100432702C - Metal detection device - Google Patents
Metal detection device Download PDFInfo
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- CN100432702C CN100432702C CNB2005800174021A CN200580017402A CN100432702C CN 100432702 C CN100432702 C CN 100432702C CN B2005800174021 A CNB2005800174021 A CN B2005800174021A CN 200580017402 A CN200580017402 A CN 200580017402A CN 100432702 C CN100432702 C CN 100432702C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
Abstract
There is provided a metal detection device capable of effectively detecting a metal mixed in food or the like by generating AC magnetic field simultaneously tuned to respective frequencies by a single transmission coil in response to frequency components of different frequencies without switching an element by a switch or the like. Constituent elements constituting magnetic field generation means (2) are connected so that a transmission coil L1 and a capacitor C1 resonate in the first frequency F1. Moreover, constituent elements are connected so that the transmission coil L1 and a capacitor C2 resonate in the second frequency F2. Furthermore, constituent elements function so as to effectively separate the capacitor C1 and capacitor C2 so that they do not interfere at least in the same frequency.
Description
Technical field
Whether the present invention relates to a kind of metal detection device, it provides AC magnetic field to tested having a medical check-up, and according to the variation in this magnetic field, check as the metal of foreign matter and sneak in tested the having a medical check-up.Having a medical check-up to tested, for example food is being provided the magnetic field of preset frequency, can detect the changes of magnetic field that causes because of the metal of sneaking in the food.Have or not in the metal detection device of magnetic metal and nonmagnetic material metal in judgement, must consider, and food is provided the magnetic field of suitable a plurality of frequencies response characteristic as the magnetic field of the wrappage of the metal of detected object, food, food itself etc.In above-mentioned metal detection device, the invention particularly relates to following technology: generate magnetic field simultaneously and effectively, realize the raising of metal detection sensitivity to show to land with a plurality of frequency contents.
Background technology
As everyone knows, desire is used AC magnetic field and the master metal that detects will be divided into magnetic and nonmagnetic material, and the former with the latter is different for the magnetic detection sensitivity of frequency (below, be called " frequency sensitivity characteristic ").And, in the packing as tested food of having a medical check-up, there are paper, resin, more have metals such as aluminium, the material of these wrappage also has the frequency sensitivity characteristic.In addition, food itself comprises for example salinity, moisture etc., so also have the frequency sensitivity characteristic that is caused by these salinity, moisture.As metal detection device, necessary utilization and magnetic or the nonmagnetic material corresponding adequate sensitivity of frequency sensitivity characteristic separately, and can identification and the sensitivity of the frequency sensitivity characteristic of food and wrappage, only detect the metal (with reference to non-patent literature 1) of sneaking in the food.
In existing metal detection device, provide the AC magnetic field of a plurality of appropriate frequency, alternatively generate AC magnetic field so utilize the time to cut apart.For example, will be in order to the magnetic field of the frequency F1 that detects magnetic and magnetic field in order to the frequency F2 that detects nonmagnetic material, utilize the mode that the time cuts apart, promptly alternatively impose on food every time T by sending coil (as aerial coil), to be divided into frequency F1 and frequency F2 by the signal that receiving coil received through food again, and handle frequency F1 composition and frequency F2 composition respectively, thereby individually judge to have or not respectively and sneak into magnetic, nonmagnetic material (for example with reference to patent documentation 1).
In the case, owing to each frequency separately independently driving magnetic field handle, so be easy to selection, setpoint frequency, but need spended time inspection during because of mutual generation magnetic field, and when switching the driving sequential that sends coil etc., have the response time, and until the stable spended time that needs in magnetic field mutual, so when the food that moves for utilizing belt conveyor (belt conveyor) etc. is checked, the shortcoming that exists efficient to improve.
On the other hand, form magnetic field simultaneously with 2 different frequencies and detect the device of metal (for example, with reference to patent documentation 2) for eliminating above-mentioned defective of alternatively carrying out the metal detection device that frequency switches, also existing.
In the case, the problem that is caused by the switching time of patent documentation 1 disappears.Yet, because to 2 frequencies of same transmission coil input, near the frequency and near the signal of the frequency hundreds of kHz tens of kHz for example, thus the transmission coil driver in necessary formation broadband, and do not constitute tuned circuit (tuning circuit).Therefore, the Q of so-called tuned circuit (=preserving energy/consumed energy=wL/R=centre frequency/frequency band, wL is the reactance that sends coil, R is the resistance components of tuned circuit) low, it is poor to drive efficient, and the result causes detection sensitivity low.The low metal detection device that is meant of sensitivity is the device of checking as the part of " quality of food ", from the safety meaning, may become fatal problem, thereby be difficult to real practicability.
Non-patent literature 1: the Kubo temple luxuriant and other 7 show " Super Mepoli II metal detection machine ", anritsu technology, anritsu Co., Ltd., in July, 1999 distribution, No.78,69 pages to 75 pages.
Patent documentation 1: the special public clear 63-41502 communique of Jap.P. (claim scope, the 3rd hurdle the 23rd walk to the 42nd row, and the 6th hurdle the 10th walks to the 44th row, the 3rd figure, the 7th figure).
Patent documentation 2: the real fair 4-11187 communique of Jap.P. (the claim scope of utility model registration, the 4th hurdle the 26th walk to the 6th hurdle the 27th row, the 5th figure).
The problem of above-mentioned patent documentation 2 sends coil owing to utilizing 2 big frequencies of difference on the frequency to drive 1, so can't tuning (resonance).If when each frequency, utilize switch capacitor such as switch, can be at each frequency tuning, yet, will be absorbed in the problem identical thus with patent documentation 1.
Summary of the invention
The object of the present invention is to provide a kind of metal detection device, it does not utilize switch etc. to switch, but the different a plurality of frequency contents of response frequency, formation sends coil with 1 and carries out tuning structure, and be created in the AC magnetic field of each frequency tuning simultaneously, thereby can check the metal of sneaking in food etc. efficiently.
For reaching above-mentioned purpose, the present invention forms following structure: certain a group composed component that constitutes the magnetic field generation unit is connected, so that send coil L1 and capacitor C1 resonance when the 1st frequency F1, and certain other a group composed component is connected (herein, sometimes a part that comprises certain a group composed component), so that send coil L1 and capacitor C2 resonance when the 2nd frequency F2.In addition, the present invention forms as follows and the structure of effect, that is, above-mentioned each element is effectively isolated in capacitor C1 and capacitor C2 non-interfering mode when the same frequency at least.
Herein, a part of term is defined.The title of " function portion " as mentioned above, for example, response frequency (may not response frequency) because of some composed component has a plurality of functions, effect, recognizes that it is functional, functionality and the independent performance carried out.For example, it forms following structure: the element that plays the connection effect by the tuning mode of the 1st frequency F1 is in the mode effect of the 2nd frequency F2 to isolate, similarly, play the element of connection effect in the mode effect of the 1st frequency F1 by the tuning mode of the 2nd frequency F2 to isolate.Therefore, the statement of " function portion " is that the structure of invention is independently showed aspect functional, functionality, must be with element independently or circuit and constituting independently and can not be interpreted as each " function portion ".
" electric connection " comprises the situation of carrying out wiring with wiring or electronic component, also comprises the situation that magnetic connects, and it refers to the implication that frequent physical property connects.Interactional situation that " connection " expression (makes it) in order to realize specific function.For example, be expressed as follows implication: each element responds frequency, performance (connection) intrinsic function in said frequencies, thus help tuning function.Therefore, can not be interpreted as and only represent electrical connection." effectively isolate " being meant that both sides all electrically connect, but function is not disturbed mutually.Can be described as " connection ", also can be described as " effectively connecting ".
For achieving the above object, particularly, first invention is a kind of metal detection device, comprise magnetic field generation unit and receiving coil, wherein, above-mentioned magnetic field generation unit utilization transmission coil L1 comprises the magnetic field that the 1st frequency reaches 2nd frequency different with above-mentioned the 1st frequency towards the tested generation of having a medical check-up of moving; Above-mentioned receiving coil detects the change in above-mentioned tested above-mentioned magnetic field when mobile of having a medical check-up, and detect contained metal in above-mentioned tested the having a medical check-up according to the field variation that above-mentioned receiving coil detected, and above-mentioned magnetic field generation unit comprises above-mentioned transmission coil, the 1st capacitor C1 and the 2nd capacitor C2, and above-mentioned transmission coil electrically is connected with the 1st capacitor and the 2nd capacitor, and above-mentioned magnetic field generation unit comprises connecting portion, it receives above-mentioned the 1st frequency and the 2nd frequency, above-mentioned connecting portion comprises the 1st tuber function portion and the 2nd tuber function portion, wherein, the 1st tuber function portion comprise above-mentioned transmission coil and above-mentioned the 1st capacitor and with the 1st frequency tuning, and the 2nd tuber function portion comprise above-mentioned transmission coil and above-mentioned the 2nd capacitor and with above-mentioned the 2nd frequency tuning.
Second invention makes above-mentioned connecting portion comprise isolation features portion as described in first invention, and above-mentioned isolation features portion isolates above-mentioned the 1st capacitor and above-mentioned the 2nd tuber function portion effectively, and above-mentioned the 2nd capacitor and above-mentioned the 1st tuber function portion are isolated effectively.
As described in the 3rd invention is invented as first, make above-mentioned connecting portion respond above-mentioned the 1st frequency, so that above-mentioned transmission coil is connected with above-mentioned the 1st capacitor, constitute above-mentioned the 1st tuber function portion thus, and above-mentioned connecting portion responds the 2nd frequency, above-mentioned transmission coil is connected with the 2nd capacitor, constitutes above-mentioned the 2nd tuber function portion thus.
As described in the 4th invention is invented as the first or the 3rd, above-mentioned connecting portion comprises isolation features portion, this isolation features portion responds above-mentioned the 1st frequency and the 2nd frequency, so that above-mentioned the 1st capacitor and above-mentioned the 2nd capacitor do not disturb mutually in the frequency field of each self-tuning at least and isolate.
The 5th invention is a kind of metal detection device, comprises magnetic field generation unit and receiving coil, and wherein, the generation unit utilization of above-mentioned magnetic field sends coil and comprises the magnetic field that the 1st frequency reaches 2nd frequency different with above-mentioned the 1st frequency towards the tested generation of having a medical check-up of moving; Above-mentioned receiving coil detects the change in above-mentioned tested above-mentioned magnetic field when mobile of having a medical check-up, and detect contained metal in above-mentioned tested the having a medical check-up according to the field variation that above-mentioned receiving coil detected, and above-mentioned magnetic field generation unit comprises: the 1st capacitor, the 2nd capacitor and transmission coil; The 1st signal generation unit is exported above-mentioned the 1st frequency signal to an end of above-mentioned the 1st capacitor; The 2nd signal generation unit is exported the 2nd frequency signal to an end of above-mentioned the 2nd capacitor; The 1st connecting portion comprises the 1st coil, and the other end of above-mentioned the 1st capacitor, above-mentioned the 1st coil, above-mentioned transmission coil are connected in the mode of series connection; And the 2nd connecting portion, comprise the 2nd coil, and the other end of above-mentioned the 2nd capacitor, above-mentioned the 2nd coil, above-mentioned transmission coil are connected in the mode of series connection, and be connected in the mode that is parallel to above-mentioned transmission coil, wherein with above-mentioned the 1st connecting portion
Above-mentioned the 1st capacitor, above-mentioned the 1st coil and above-mentioned transmission coil constitute the 1st tuber function portion with above-mentioned the 1st frequency tuning; Above-mentioned the 2nd capacitor, above-mentioned the 2nd coil and above-mentioned transmission coil constitute the 2nd tuber function portion with above-mentioned the 2nd frequency tuning.
The 6th invention is a kind of metal detection device, comprises magnetic field generation unit and receiving coil, and wherein, the generation unit utilization of above-mentioned magnetic field sends coil, comprises the magnetic field that the 1st frequency reaches 2nd frequency different with above-mentioned the 1st frequency towards the tested generation of having a medical check-up of moving; Above-mentioned receiving coil detects the change in above-mentioned tested above-mentioned magnetic field when mobile of having a medical check-up, and detect contained metal in above-mentioned tested the having a medical check-up according to the field variation that above-mentioned receiving coil detected, and above-mentioned magnetic field generation unit comprises above-mentioned transmission coil, the 1st capacitor C1 and the 2nd capacitor C2, and above-mentioned transmission coil electrically is connected with the 1st capacitor and the 2nd capacitor, and above-mentioned magnetic field generation unit comprises connecting portion 2a, above-mentioned connecting portion comprises the 1st 2aa of tuber function portion, the 2nd 2ab of tuber function portion and the 2ac of isolation features portion, wherein, above-mentioned the 1st 2aa of tuber function portion is at above-mentioned the 1st frequency field, and is tuning in the mode that comprises above-mentioned transmission coil and the 1st capacitor; The 2nd 2ab of tuber function portion is at above-mentioned the 2nd frequency field, and is tuning in the mode that comprises above-mentioned transmission coil and the 2nd capacitor; The 2ac of isolation features portion eliminates the influence of the 2nd tuber function portion to above-mentioned the 1st tuber function portion at above-mentioned the 1st frequency field, and at above-mentioned the 2nd frequency field, eliminates the influence of the 1st tuber function portion to above-mentioned the 2nd tuber function portion.
According to first to the 5th invention, by the different a plurality of frequency contents of response frequency, and total send coil and tuning structure when being formed on a plurality of frequency, and, according to the 6th invention, stop the influence that causes to the other side to form respectively by 2 tuber function portions and can distinguish tuning structure, therefore, the AC magnetic field at each frequency tuning is produced simultaneously efficiently.And, can improve the detection sensitivity that metal is sneaked into thus, preferable effect is to check the metal of sneaking in food etc. efficiently.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is the functional block diagram of example of the present invention.
Fig. 2 (a) and (b) be to comprise the structural drawing of the 1st embodiment of magnetic field generation unit 2 of connecting portion 2a among Fig. 1 and the function of composed component, the synoptic diagram of effect.
Fig. 3 (a) and (b) and (c) be to comprise the structural drawing of the 2nd embodiment of magnetic field generation unit 2 of connecting portion 2a among Fig. 1 and the function of composed component, the synoptic diagram of effect.
Fig. 4 (a) and (b) be to comprise the structural drawing of the 3rd embodiment of magnetic field generation unit 2 of connecting portion 2a among Fig. 1 and the function of composed component, the synoptic diagram of effect.
Fig. 5 (a) and (b) be the function that comprises the structural drawing of the 4th embodiment of magnetic field generation unit 2 of connecting portion 2a among Fig. 1 and composed component, the effect (synoptic diagram of F1＜F2).
Equivalent electrical circuit among Fig. 6 (a) presentation graphs 4 (a), wherein R11 is the residual resistance of L8, and R12 is the residual resistance of L9, and RL is the residual resistance of L1.Fig. 6 (b) is the synoptic diagram of the simulated data of circuit among Fig. 6 (a), and I (R11) *, I (R12) * are the electric currents that utilizes signal generation unit 1a to flow to R11; I (R11) * *, I (R12) * * are the electric currents that utilizes signal generation unit 1b to flow to R12.
Fig. 7 is the synoptic diagram of the frequency sensitivity characteristic tendency of each material.
1,1a, 1b: signal generation unit 2: magnetic field generation unit
2a: connecting portion 2aa:F1 tuber function portion (the 1st tuber function portion)
The 2ac of 2ab:F2 tuber function portion (the 2nd tuber function portion): isolation features portion
3: testedly have a medical check-up 4: receiving coil
5: amplifier 6: branching filter
7a, 8b: detecting unit 8a, 7b: wave filter
9a, 9b: identifying unit 10: processing unit
11: phase-shifting unit
C1, C2, C3, C4, C5, C6, C7, C8: capacitor
F1, F2: frequency L1: send coil
L2, L3, L4, L5, L6, L7, L8, L9, L10: coil
R11, R12, RL: resistance
T1, T2, T3, T4, T5, T6, T7: transformer
T1a, T1b, T1c, T6a, T6b, T7a, T7b: coil
Embodiment
Below use Fig. 1 to Fig. 7 that form of the present invention is described.Fig. 1 is the functional block diagram of the technological thought of expression metal detection device of the present invention.Fig. 2 (a) and (b)～Fig. 6 (a) and (b) be each structural drawing of the 1st embodiment～the 4th embodiment of comprising the magnetic field generation unit 2 of connecting portion 2a among Fig. 1 and the function of composed component, the synoptic diagram of effect.Fig. 7 is the synoptic diagram of tendency of the magnetic frequency sensitivity characteristic of each material.
Among Fig. 1, signal generation unit 1 output comprises different at least a plurality of frequency F1 compositions and F2 composition and (establishes the signal of F1＜F2).Signal generation unit 1 has signal source that produces frequency F1 and the signal source that produces frequency F2, and it can form above-mentioned each signal source is overlapping and structure output also can form from beginning to have said frequencies F1 composition and both structures of frequency F2 composition at first.Following embodiment represents separately to use both examples.
The concrete frequency values of frequency F1 or F2, because of considering the frequency sensitivity characteristic of each material shown in Figure 7, promptly, as tested 3 the food of having a medical check-up, sneak into the frequency sensitivity characteristic of metal (magnetic, nonmagnetic material that desire detects) wherein, the wrappage of food etc., can be distinguished with food and wrappage thereby be set at, only be discerned metal and the frequency that detects.Generally speaking, be set at the interior frequency of tens of kHz～hundreds of kHz scopes.And low frequency (frequency F1) is used to detect magnetic, and high-frequency (frequency F2) is used to detect nonmagnetic material.In addition, below be formation, the running of explanation when frequency F1 and these 2 frequencies of F2, and in case when having metal to sneak into, corresponding to the material of expecting, even 3 frequencies also belong to category of the present invention.
Magnetic field generation unit 2 is the structure that comprises connecting portion 2a, sends coil L1, capacitor C1 and capacitor C2.Sending coil L1, capacitor C1 and capacitor C2 is the composed component of tuned circuit, and electrically connects with connecting portion 2a.Connecting portion 2a makes and sends coil L1 and capacitor C1 being connected (functional structure that is connected being called " the F1 tuber function 2aa of portion ") in the mode of frequency F1 tuning (resonance), and makes transmission coil L1 and capacitor C2 to be connected (functional structure that is connected being called " the F2 tuber function 2ab of portion ") in the mode of frequency F2 tuning (resonance).
Above-mentioned F1 tuber function 2aa of portion and the F2 tuber function 2ab of portion will send coil L1 as the part of tuned cell and shared, and the tuned frequency difference.Therefore, connecting portion 2a is in the zone that comprises frequency F1 and F2, capacitor C1 and capacitor C2 function and the effect aspect frequency effectively isolated (functional structure of being isolated being called " 2ac of isolation features portion "), so that frequency F2 tuber function is not had effect as the function of the capacitor C1 of the part of the tuned cell of frequency F1, and making as the function of the capacitor C2 of the part of the tuned cell of frequency F2 does not have effect to frequency F1 tuber function.
In this way, connecting portion 2a in function, use and constitute the F1 tuber function 2aa of portion, the F2 tuber function 2ab of portion and the 2ac of isolation features portion, but the composed component of each part mentioned above mainly comprises transformer, coil and/or capacitor etc.Between above-mentioned each element, above-mentioned each element and sending between coil L1, capacitor C1 and the C2, be to electrically connect (comprising magnetic during electric connection connects) directly or indirectly.The value of above-mentioned each element and characteristic are determined by following content: above-mentioned each 2aa of tuber function portion, 2ab and the 2ac of isolation features portion with which kind of circuit mode constitute, and make employed each element of each part mentioned above in frequency F1 and F2 zone, how to bear above-mentioned each tuber function and isolation features.Its concrete example is by embodiment 1,2,3 and 4 explanations.
Begin to move processing from receiving coil 4 until judging whether that metal is sneaked into, identical with patent documentation 2 in principle, so illustrate simply at this.
The AC magnetic field that receiving coil 4 detects frequency F1 and F2 is in tested 1 the variation of having a medical check-up, and said frequencies F1 and F2 produce tested 1 (the comprising the metal of sneaking into) of having a medical check-up that magnetic field generation unit 2 moves towards utilizing belt conveyor (not shown).Receiving coil 4 changes the variation in magnetic field and detects as the amplitude (phase place) of frequency F1 composition or frequency F2 composition.Receiving coil 4 has 2 coils, the mode that these 2 coils reverse each other with phase place and connecting, and the signal of expression changes of magnetic field utilizes amplifier 5 amplifications after taking out from the tap (tap) of the resistance R 1 of the output balance that makes above-mentioned two coils.
Branching filter 6 (splitter) makes signal be divided into each signal of frequency F1 composition and frequency F2 composition.Its reason is in following processing, the processing of frequency F1 composition and the processing of frequency F2 composition to be handled in separate lines.That is, the metal detection processing of independently carrying out magnetic is handled with the metal detection of nonmagnetic material.
Detecting unit 7a, wave filter 8a and identifying unit 9a detect frequency F1 composition, detecting unit 7a receives and the synchronous synchronizing signal of frequency F1 composition from phase-shifting unit 11, and extraction frequency F1 composition, and make its integration by wave filter 8a, utilize the more above-mentioned institute of the identifying unit 9a principal value of integral and the standard value of magnetic of storage in advance again.When integrated value overgauge value, judge the magnetic metal of sneaking into as foreign matter; When integrated value during, judge the metal of not sneaking into as foreign matter smaller or equal to standard value.
Detecting unit 7b, wave filter 8b and identifying unit 9b detect frequency F2 composition, detecting unit 7b receives and the synchronous synchronizing signal of frequency F2 composition from phase-shifting unit 11, and extraction frequency F2 composition, and make its integration by wave filter 8b, utilize the more above-mentioned institute of the identifying unit 9b principal value of integral and the standard value of nonmagnetic material of storage in advance again.When integrated value overgauge value, judge the nonmagnetic material metal of sneaking into as foreign matter; When integrated value during, be judged to be the metal of not sneaking into as foreign matter smaller or equal to standard value.
Processing unit 10 is carried out the processing that outputs to display unit etc. in order to the result of determination with identifying unit 9a and 9b.
[embodiment 1]
Fig. 2 (a) is the electrical structure synoptic diagram as the embodiment of the magnetic field generation unit 2 of this example.Fig. 2 (b) represents major function, the effect of each composed component.Tuned cell among Fig. 2 (b) and to help the Connection Element of tuber function be the main element of tuber function portion, isolated component are the main elements (below, Fig. 3 (b), Fig. 3 (c), Fig. 4 (b), Fig. 5 (b) are also identical) of isolation features portion.
Among Fig. 2 (a), signal generation unit 1 will comprise the signal of frequency F1 composition and F2 composition, and (F1＜F2) is by coil T1c, the T1b of transformer T1, and is input to magnetic field generation unit 2.The dotted portion of Fig. 2 (a) is represented connecting portion 2a.Among Fig. 2 (a), be set at the value that makes coil L2 and capacitor C3 parallel resonance, coil L3 and capacitor C4 parallel resonance when frequency F1 when frequency F2.
Therefore, in frequency F1 zone, send coil L1 to come via the coil T1a of transformer T1 and T1b, coil L2 (being Low ESR when the frequency F1) and tuning (resonance) with capacitor C1 ways of connecting.In frequency F2 zone, send coil L1 to come via the coil T1a of transformer T1 and T1b, capacitor C4 (being Low ESR when the frequency F2) and tuning (resonance) with capacitor C2 ways of connecting.
That is, send coil T1a and T1b, coil L2 and the capacitor C1 formation F1 tuber function 2aa of portion of coil L1, transformer T1; And the coil T1a of transmission coil L1, transformer T1 and T1b, capacitor C4 and capacitor C2 constitute the F2 tuber function 2ab of portion.And coil L2 and capacitor C3 be parallel resonance when frequency F2, constitutes the 2ac of isolation features portion thus.The 2ac of this isolation features portion is in frequency F2 zone, capacitor C1 is isolated effectively from capacitor C2 or the F2 tuber function 2ab of portion, similarly, coil L 3 and capacitor C4 make capacitor C2 isolate effectively from capacitor C1 or the F1 tuber function 2aa of portion in frequency F1 zone.On the other hand, coil L2, capacitor C4 are Low ESR when frequency F1, frequency F2 respectively, and as by element (pass device), help the connection of the F1 tuber function 2aa of portion, the F2 tuber function 2ab of portion.
[embodiment 2]
Fig. 3 (a) is the synoptic diagram as the electrical structure of other embodiment of magnetic field generation unit 2.When the frequency of the signal of the frequency F1 composition of signal generation unit 1a among Fig. 3 (b) presentation graphs 3 (a) output is lower than the frequency of signal of frequency F2 composition of signal generation unit 1b output (F1＜F2), the major function of each composed component, effect.When the frequency of the signal of the frequency F1 composition of signal generation unit 1a among Fig. 3 (c) presentation graphs 3 (a) output is higher than the frequency of signal of frequency F2 composition of signal generation unit 1b output (F1＞F2), the major function of each composed component, effect.Among Fig. 3 (a), signal generation unit 1a, 1b are input to magnetic field generation unit 2 via transformer T2, T3 respectively with the signal of frequency F1 composition, the signal of frequency F2 composition.
Following according to Fig. 3 (a) and Fig. 3 (b), (F1＜F2) be illustrated is with major function, the effect that shows each composed component the frequency of the signal of the frequency F1 composition among Fig. 3 (a) to be lower than the situation of frequency of signal of frequency F2 composition.Among Fig. 3 (a), in frequency F1 zone, send series resonant circuit (at frequency F1 resonance) and the transformer T2 of coil L1 via series resonant circuit (at frequency F1 resonance), coil L7 and the capacitor C8 of coil L4 and capacitor C5, and be connected with capacitor C1, and, thereby constitute the F1 tuber function 2aa of portion at frequency F1 tuning (resonance).In frequency F2 zone, send coil L1 via capacitor C6, C7 when frequency F2 (all be Low ESR) and transformer T3, and is connected with capacitor C2, and at frequency F1 tuning (resonance), thereby the formation F2 tuber function 2ab of portion.
Among Fig. 3 (a) and Fig. 3 (b), when frequency F1, coil L6 and capacitor C7 parallel resonance, and frequency F1 and capacitor C2 are isolated, and coil L5 and capacitor C6 make frequency F2 and capacitor C1 isolation at frequency F1 parallel resonance; When frequency F2, coil L4 is that high impedance, coil L7 are high impedance, thereby frequency F2 and capacitor C1 are isolated, and constitutes the isolation features 2ac of portion.
When the frequency F1 among Fig. 3 (a) be higher than frequency F2 (during F1＞F2), shown in Fig. 3 (c), tuned cell is identical with Fig. 3 (b), but help tuber function portion Connection Element, constitute the isolated component difference of isolation features portion.In this detailed.In addition, and nonessentially having transformer T2 and a T3, also can be directly to link the one-level of above-mentioned transformer and the form of secondary.The frequency of implementing, the element of use etc. have been considered and forming circuit is comparatively desirable.
[embodiment 3]
Fig. 4 (a) is the synoptic diagram as the electrical structure of other embodiment of magnetic field generation unit 2.Fig. 4 (b) represents major function, the effect of each composed component. Signal generation unit 1a, 1b are with the signal of frequency F1 composition and the signal of frequency F2 composition (F1 in this example＜F2) respectively via capacitor C1 and transformer T4, capacitor C2 and transformer T5, and be input to magnetic field generation unit 2 among Fig. 4.Wherein, the impedance of the signal generation unit 1a that observes from capacitor C1, and the impedance of the signal generation unit 1b that observes from capacitor C2 are low value when frequency separately at least.
Among Fig. 4, in frequency F1 zone, send coil L1 with via coil L8 and transformer T4 and with capacitor C1 ways of connecting carry out tuning (at this moment, L1+L8 and C1 resonance), thereby constitute the F1 tuber function 2aa of portion, and observe the 2ac of isolation features portion of the high impedance formation blocking capacitor C2 of capacitor C2 side from coil L1.In frequency F2 zone, send coil L1 with via coil L9 and transformer T5 and with capacitor C2 ways of connecting carry out tuning (at this moment, L1+L9 and C2 resonance), thereby constitute the F2 tuber function 2ab of portion, observe the 2ac of isolation features portion of the high impedance formation blocking capacitor C1 of capacitor C1 side from coil L1.That is, the 2ac of isolation features portion among Fig. 4 (a) observes the F1 tuber function 2aa of portion and the F2 tuber function 2ab of portion for being connected in parallel from sending coil L1, and formation therefrom.In addition, and nonessentially having transformer T4 and a T5, also can be the form that directly links above-mentioned each transformer one-level and secondary.The frequency of consider implementing, the element of use etc. and forming circuit is comparatively desirable.
The equivalent electrical circuit of displayed map 4 (a) among Fig. 6 (a) shows its analog result among Fig. 6 (b).Resistance R 11, R12 and the RL of Fig. 6 is respectively the equivalent resistance of coil L8, the equivalent resistance of coil L9 and the equivalent resistance of transmission coil L1.Among Fig. 6 (b), transverse axis is represented frequency, and the longitudinal axis is represented accurate position (level), all represents with log scale.Utilize coil L8 and send any that coil L1 is tuned as frequency F1=30～80kHz, and utilize coil L9 and transmission coil L1 to be tuned as about 4 times value that frequency F2 equals frequency F1, design in this way, make resistance R 11, R12 be 0.5 ohm again, and to make RL be 0.1 ohm, calculates thus.Electric current I (R11), I (R12) and I (RL) are the electric current of flow through resistance R 1, R2 and RL.So far, I (RL) is for producing the electric current in expection magnetic field.
According to Fig. 6 (b), can draw following result.The 1st, near the degree of tilt of the tuning curve the frequency F1 and near the degree of tilt the frequency F2, Q (being roughly 50～60) is roughly the same.The 2nd, the electric current I (R11) in above-mentioned 2 tuned frequencies is isolation A, B with the difference of electric current I (R12), can guarantee this isolation substantially fully.That is, the Q in each tuned frequency represents the good degree of tuber function portion, and isolation is represented the good degree of isolation features portion.
In addition, said frequencies F1 is applicable to the detection of magnetic metal, and frequency F2 is applicable to the detection of nonmagnetic material metal.
[embodiment 4]
Fig. 5 (a) is the synoptic diagram as the electrical structure of other embodiment of the magnetic field generation unit 2 of this example.Fig. 5 (b) represents major function, the effect of each composed component.Among Fig. 5, signal generation unit 1a generates and comprises the signal of frequency F1, and supplies to the transmission coil L1 and the capacitor C1 of each different coils that are connected in transformer T6.Send coil L1 and be connected by transformer T6, carry out tuning (the F1 tuber function 2aa of portion) at frequency F1 with capacitor C1.The signal of signal generation unit 1b generated frequency F2, and supply to the transmission coil L1 and the capacitor C2 of each different coils that are connected in transformer T7.Transmission coil L1 utilizes transformer T7 with capacitor C2 and is connected, and carries out tuning (the F2 tuber function 2ab of portion) at frequency F2.
On the other hand, sending coil L1 and the coil T6a of transformer T6 and the coil T7b of transformer T7 is connected in series.And the coil T7a of the coil T6b of transformer T6, coil L10 and transformer T7 intersects back and being connected in series at the output line that makes coil T7a (perhaps, also can be the output line of coil T6a).The inductance value of coil L10 is roughly the same with the value that sends coil L1.In addition, be marked on the coil of transformer T6, T7 among Fig. 5 (a) ● symbolic representation polarity.
In the structure shown in Fig. 5 (a), when being conceived to frequency F1, the composition of frequency F1 results from any among coil T6a, coil T6b, coil T7b, the coil T7a, but therein, result from the frequency F1 composition of coil T7b, its reverse composition by in coil T7b, being produced because of the frequency F1 composition that results from coil T7a, thus be eliminated (composition offsets).For frequency F2 composition, also can describe equally.Promptly, the composition of frequency F2 results from any among coil T7a, coil T7b, coil T6a, the coil T6b, but therein, results from the frequency F2 composition of coil T6a, its reverse composition by in coil T6a, being produced because of the frequency F2 composition that results from coil T6b, thus be eliminated.Coil L10 is to use with the coil that sends the identical value of coil and comes electrode compensation, makes the elimination of mentioned component more complete with this.
Therefore, the coil T6b of transformer T6, coil L10, and the coil T7a of transformer T7 in the zone of frequency F1, can ignore from sending the observed transformer T7 side (also helping the F1 tuber function) of coil L1, so can make capacitor C2 and tuning transmission coil L1 and capacitor C1 isolation; In the zone of frequency F2, can ignore from sending the observed transformer T6 side (also helping the F2 tuber function) of coil L1, so make capacitor C1 and tuning transmission coil L1 and capacitor C2 isolation (constituting the isolation features 2ac of portion).
Among Fig. 5 (a), the output line of transformer T7a is intersected, but also can replace above-mentioned situation, the output line of the arbitrary coil among T6b, T6a, the T7a is intersected.And, the output line of coil is intersected, but make coil direction become contrary direction.Under arbitrary situation,, and stop capacitor C2 that the effect of the F1 tuber function 2aa of portion is got final product as long as stop the effect of capacitor C1 to F2 tuber function 2ab.And, Fig. 5 (a) represents with understandable circuit, but consider all variation such as shared coil, following technology also belongs to category of the present invention, promptly, formation is by sending coil L1, coil T6a (the F1 tuber function 2aa of portion side), the formed loop of coil T7b (the F2 tuber function 2ab of portion side), and in the loop identical with it, formation is by coil T6b (the F1 tuber function 2aa of portion side), the formed loop of coil T7a (the F2 tuber function 2ab of portion side), eliminating the influence that is caused by the F1 tuber function 2aa of the portion side direction F2 tuber function 2ab of portion side, and eliminate the influence that is caused by the F2 tuber function 2aa of the portion side direction F1 tuber function 2ab of portion side.
In the foregoing description, embodiment 1 and the 2 big elements of special frequency of utilization interdependence and constitute, embodiment 3 and embodiment 4 medium frequency interdependences are little.Especially among the embodiment 4, except that frequency F1, frequency F2 the shared transmission coil L1 and coil L10, only as capacitor C1, the C2 of resonant element, even so non-response frequency of connecting portion 2a of embodiment 4, also can constitute each 2aa of tuber function portion, 2ab and the 2ac of isolation features portion (therefore, certainly in frequency F1 zone, the arbitrary function of frequency F2 zone performance).According to as mentioned above, embodiment 4 by the frequency design, the element adjusting less, easily make and constituting.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the structure that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, but every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (3)
1, a kind of metal detection device, comprise magnetic field generation unit (2) and receiving coil (4), above-mentioned magnetic field generation unit (2) utilization sends coil (L1) and comprises the magnetic field that the 1st frequency reaches 2nd frequency different with above-mentioned the 1st frequency towards the tested generation of having a medical check-up of moving; Above-mentioned receiving coil (4) detects the change in above-mentioned tested above-mentioned magnetic field when mobile of having a medical check-up, and detects contained metal in above-mentioned tested the having a medical check-up according to the field variation that above-mentioned receiving coil detected, and described metal detection device is characterised in that:
Above-mentioned magnetic field generation unit comprises:
Above-mentioned transmission coil, the 1st capacitor (C1) and the 2nd capacitor (C2), and above-mentioned transmission coil electrically is connected with the 1st capacitor and the 2nd capacitor;
Connecting portion (2a) receives above-mentioned the 1st frequency and the 2nd frequency, and above-mentioned connecting portion comprises:
The 1st tuber function portion (2aa) comprises above-mentioned transmission coil, and connects and tuning above-mentioned the 1st capacitor with above-mentioned the 1st frequency;
The 2nd tuber function portion (2ab) comprises above-mentioned transmission coil, and connects and tuning above-mentioned the 2nd capacitor with above-mentioned the 2nd frequency; And
Isolation features portion (2ac), with the zone isolation of above-mentioned the 1st capacitor and above-mentioned the 2nd frequency, and with the zone isolation of above-mentioned the 2nd capacitor and above-mentioned the 1st frequency, and prevent mutual interference;
Wherein, above-mentioned magnetic field generation unit constitutes from 1 above-mentioned transmission coil (L1) and will contain the magnetic field of above-mentioned the 1st frequency and above-mentioned the 2nd frequency simultaneously towards the above-mentioned tested generation of having a medical check-up;
Described metal detection device also comprises:
The partial wave unit is arranged on a receiver side, and the field variation partial wave that above-mentioned receiving coil (4) is detected goes out the 1st frequency content and the 2nd frequency content;
Described metal detection device carries out metal detection based on above-mentioned the 1st frequency content, and carries out metal detection based on above-mentioned the 2nd frequency content.
2, a kind of metal detection device, comprise magnetic field generation unit (2) and receiving coil (4), above-mentioned magnetic field generation unit (2) utilization sends coil (L1) and comprises the magnetic field that the 1st frequency (F1) reaches 2nd frequency (F2) different with above-mentioned the 1st frequency towards the tested generation of having a medical check-up of moving; Above-mentioned receiving coil (4) detects the change in above-mentioned tested above-mentioned magnetic field when mobile of having a medical check-up, and detects contained metal in above-mentioned tested the having a medical check-up according to the field variation that above-mentioned receiving coil detected, and described metal detection device is characterised in that:
Above-mentioned magnetic field generation unit comprises:
The 1st capacitor (C1), the 2nd capacitor (C2) and 1 above-mentioned transmission coil (L1);
The 1st signal generation unit (1a) is exported the signal of above-mentioned the 1st frequency to an end of above-mentioned the 1st capacitor;
The 2nd signal generation unit (1b) is exported the signal of the 2nd frequency to an end of above-mentioned the 2nd capacitor;
The 1st connecting portion comprises the 1st coil (L8), and the other end of above-mentioned the 1st capacitor, above-mentioned the 1st coil, above-mentioned transmission coil are connected in the mode of series connection; And
The 2nd connecting portion comprises the 2nd coil (L9), and the other end of above-mentioned the 2nd capacitor, above-mentioned the 2nd coil, above-mentioned transmission coil are connected in the mode of series connection, and is connected in the mode that is parallel to above-mentioned transmission coil with above-mentioned the 1st connecting portion, wherein
Above-mentioned the 1st capacitor, above-mentioned the 1st coil, and above-mentioned transmission coil constitute the 1st tuber function portion (2aa) with above-mentioned the 1st frequency tuning;
Above-mentioned the 2nd capacitor, above-mentioned the 2nd coil and above-mentioned transmission coil constitute the 2nd tuber function portion (2ab) with above-mentioned the 2nd frequency tuning;
Wherein, above-mentioned magnetic field generation unit constitutes from 1 above-mentioned transmission coil (L1) and will contain the magnetic field of above-mentioned the 1st frequency and above-mentioned the 2nd frequency simultaneously towards the above-mentioned tested generation of having a medical check-up;
Described metal detection device also comprises:
The partial wave unit is arranged on a receiver side, and the field variation partial wave that above-mentioned receiving coil (4) is detected goes out the 1st frequency content and the 2nd frequency content;
Described metal detection device carries out metal detection based on above-mentioned the 1st frequency content, and carries out metal detection based on above-mentioned the 2nd frequency content.
3, a kind of metal detection device, comprise magnetic field generation unit (2) and receiving coil (4), above-mentioned magnetic field generation unit (2) utilization sends coil (L1) and comprises the magnetic field that the 1st frequency reaches 2nd frequency different with above-mentioned the 1st frequency towards the tested generation of having a medical check-up of moving; Above-mentioned receiving coil (4) detects the change in above-mentioned tested above-mentioned magnetic field when mobile of having a medical check-up, and detects contained metal in above-mentioned tested the having a medical check-up according to the field variation that above-mentioned receiving coil detected, and described metal detection device is characterised in that:
Above-mentioned magnetic field generation unit comprises:
1 above-mentioned transmission coil, the 1st capacitor (C1) and the 2nd capacitor (C2), and above-mentioned transmission coil electrically is connected with the 1st capacitor and the 2nd capacitor; And
Connecting portion (2a) comprising:
The 1st tuber function portion (2aa), in above-mentioned the 1st frequency field, tuning in the mode that comprises above-mentioned transmission coil and above-mentioned the 1st capacitor;
The 2nd tuber function portion (2ab), in above-mentioned the 2nd frequency field, tuning in the mode that comprises above-mentioned transmission coil and above-mentioned the 2nd capacitor;
The influence of above-mentioned the 2nd tuber function portion to above-mentioned the 1st tuber function portion at above-mentioned the 1st frequency field, eliminated by isolation features portion (2ac), and at above-mentioned the 2nd frequency field, eliminates the influence of above-mentioned the 1st tuber function portion to above-mentioned the 2nd tuber function portion;
Wherein, above-mentioned magnetic field generation unit constitutes from magnetic field that 1 above-mentioned transmission coil (L1) will contain above-mentioned the 1st frequency and above-mentioned the 2nd frequency simultaneously towards the above-mentioned tested generation of having a medical check-up:
Described metal detection device also comprises:
The partial wave unit is arranged on a receiver side, and the field variation partial wave that above-mentioned receiving coil (4) is detected goes out the 1st frequency content and the 2nd frequency content;
Described metal detection device carries out metal detection based on above-mentioned the 1st frequency content, and carries out metal detection based on above-mentioned the 2nd frequency content.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP167597/2004 | 2004-06-04 | ||
| JP2004167597A JP4111934B2 (en) | 2004-06-04 | 2004-06-04 | Metal detector |
Publications (2)
| Publication Number | Publication Date |
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| CN1961222A CN1961222A (en) | 2007-05-09 |
| CN100432702C true CN100432702C (en) | 2008-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800174021A Expired - Fee Related CN100432702C (en) | 2004-06-04 | 2005-06-03 | Metal detection device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7663361B2 (en) |
| EP (1) | EP1760494B1 (en) |
| JP (1) | JP4111934B2 (en) |
| CN (1) | CN100432702C (en) |
| WO (1) | WO2005119302A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US7663361B2 (en) | 2010-02-16 |
| CN1961222A (en) | 2007-05-09 |
| JP2005345382A (en) | 2005-12-15 |
| JP4111934B2 (en) | 2008-07-02 |
| EP1760494A1 (en) | 2007-03-07 |
| WO2005119302A1 (en) | 2005-12-15 |
| EP1760494B1 (en) | 2018-05-02 |
| EP1760494A4 (en) | 2011-03-09 |
| US20090167299A1 (en) | 2009-07-02 |
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